iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-05-29T17:13:13Z. The update package is 581.49 MB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b4110921a497d198897b7f939917071820d5bf05.zip.